Mixer for welding torches



W. P. BROWN AND G. McA. BRITTAIN.

MIXER FOR WELDING TORCHES.

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1,41 4,454. Patfinted May 2, 1922.

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Specification of Letters Patent.

Patented Ma a 1922.

Application filed June 10, 1920. Serial No. 387,851.

To all whom it may concern:

Be it known that we, WILLIAM P. BROWN and GEORGE MoALPINn BRITTAIN, citizens of the United States, residing at 223 Main Street, San Francisco, in the county of San Francisco, State of California, have invented a new and useful Mixer for Welding Torches, of which the following is a specification, in such full and clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to an oxy-acetylene 0r oxy-hydrogen welding torch and its object is to provide means whereby the striking back or flashing back of the acetylene flame will be prevented in so far as it is likely to pass back into the hose.

The further object of the invention is to provide means whereby the mixing of the air and gas will take place in such manner as to insure the production of a completely homogeneous gas suitable for the most effective results.

7 Another object of the invention is to produce a burner tip which has its parts easily separable for cleaning and which will be so arranged as to alter the direct movement of th combustible gas column and prevent the flame from striking back into the hose any further than the mixing head.

Other objects of the invention will appear as the description proceeds.

An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout, but we are aware that there may be modifications thereof.

Figure 1 is a longitudinal sectional View through the burner tip andmixing head.

Fig. 2 is a transverse sectional view through the mixing head on the line 2-2 Fig. 1.

The numeral 1 indicates the burner handle,

which has openings 2 and 3 therethrough for the combustible gas and oxygen. The end of the handle is cored out to receive the frustoconical head 4c on one end of the tip 5 and the cored out portion of th handle is grooved as indicated at 6 and 7 to provide an expansion chamber for the gases. The burner tip consists of a tube 8 of such length as may be deemed desirable for use and it is enlarged at 9 to produce a chamber to receive the tube 5. It also has a flange at 10 by which it is secured to the burner handle 1 by means of the ring nut 11. 1

The conical head 4 has holes 12 to 14 inclusive therethrough. The holes 12 and 13 serving to deliver the oxygen from the hole 3 to the annular space 6, while the hole 14 permits the combustible gas to flow into the hole 15 within the tube 5.

The hole 14 connects the annular chamber 7 with the hole 15 and it will be observed that the holes 13 and 14: are in total area smaller than the hole 15.

lVhile smaller the total area of the hole 15 is less than the area of the hole 17in the burner tip 8.

The result of the foregoing construction is that if the velocity of the gases is slowed down at the end of the burner tip suflicient to cause the gas to strike back into the hole 15, it will not go into the hole 15 where there is a considerable increase in the velocity of the gases. If the flow is sufiiciently retarded to permit the flame to strike back into the hole 15 which will come against the upper end of the tube 5 and because of the sharp entering angle of the holes 13 and 1 1 there will be no tendency for the flame to strike back into'the hose any further than the burner mixer.

It will also appear that the expansion of the gases from the holes 2and 12 into the annular chambers 6 and 7 and their second expansion from the holes 13 and 14 into the hole 15 seems to prevent the. flame from striking back into the main oxygen opening 3.

vVhat we claim is as follows, but various modifications may be made in the construction shown in the drawings and above particularly described form, within the purview of our invention.

A burner tip for welding torches comprising a tube having two gas passages therethrough and having a frusto-conical seat with peripheral grooves at its end, a gas mixer having a frustoconical head and a central opening extending longitudinally thereof from one end toward the other end, said head having a. plurality 'of transverse openings in two series to lead th gas from axis to deliver gas from the central portion the nozzle and mixing tube to the supply of the supply tube to one of its peripheral tube.

' grooves surrounding its frusto-conical seat, a In testimony whereof We have hereunto nozzle having a chamber to loosely receive set our hands this 1st day of June, A. D. the mixer and having an opening there- 1920.

through from said chamber to its other end larger than theopening extending longitudi- WILLIAM P. BROWN. nallyinto the mixer, and means to connect GEORGE MCALPIN E BRITTAIN. 

